"The doctors were concerned it may have popped. But I don't think so. It doesn't feel good right now, but I think it will be fine," Favre said.
Doug Pederson finished up and led an effective drive that ended in an interception.
Other injuries were suffered by cornerback Michael Hawthorne, right guard Marco Rivera (hip flexor), safety Darren Sharper (shoulder) and linebacker Nick Rogers (ankle). Hawthorne was briefly knocked cold when he tried for an interception in the first quarter but landed face first on the hard turf.
Cornerback Mike McKenzie, meantime, was expected to get his first start of the season but didn't play after injuring his hamstring during Friday's practice.
"I thought he would be ready to go on Saturday," Sherman said. "Talking to the doctors on Saturday they didn't think he'd be able to make it."
McKenzie's absence was magnified as rookie first-round pick Ahmad Carroll missed the game, as well. Carroll injured his groin when colliding with Hawthorne during practice Friday.